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Capital Stock (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 13, 2015 $ / shares | Jul. 14, 2015 $ / shares | Apr. 10, 2015 $ / shares | Jan. 12, 2015 $ / shares | Jan. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2014 USD ($) | Nov. 04, 2015 USD ($) | Dec. 31, 2014 $ / shares shares
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized | shares |  |  |  |  |  | 400,000,000 |  |  | 400,000,000
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 |  |  | $ 0.01
Proceeds from sale of common stock |  |  |  |  |  | $ 7,796 | $ 0 |  |
Preferred stock, shares authorized | shares |  |  |  |  |  | 10,000,000 |  |  | 10,000,000
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 |  |  | $ 0.01
Preferred Stock, shares outstanding | shares |  |  |  |  |  | 0 |  |  | 0
Common stock partnership units option redemption ratio |  |  |  |  |  | 1 |  |  |
Dividends per Share (in dollars per share) | $ / shares |  | $ 0.1250 | $ 0.1250 | $ 0.1025 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividends per Share (in dollars per share) | $ / shares | $ 0.1250 |  |  |  |  |  |  |  |
Unaffiliated Third Parties [Member] |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Operating partnerships units held (in shares) | shares |  |  |  |  |  | 0 |  |  | 0
Common Stock [Member] |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Aggregate offering price |  |  |  |  |  | $ 200,000 |  |  |
Common stock sold in offering (in shares) | shares |  |  |  |  | 524,606 |  |  |  |
Share price of common stock sold (in dollars per share) | $ / shares |  |  |  |  | $ 15.18 |  |  |  |
Proceeds from sale of common stock |  |  |  |  | $ 7,800 |  |  |  |
Remaining amount under ATM program |  |  |  |  |  | $ 128,300 |  |  |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Value amount of shares authorized to be repurchased |  |  |  |  |  |  |  | $ 150,000 |

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